Rev limiter and other?
12-30-2006, 04:08 PM
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Rev limiter and other?
Well has anyone else noticed that the 2.2 seems to pull up to the 6500 and want to keep going? Well with the possibilities of tuning coming how high can the stock internals go safely? Im pretty much done with my car as it is now but I may get some nitrous here soon and would much rather wait til i can get somewhat of a tune?
01-02-2007, 11:28 PM
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i believe the weak point of our engines is the connecting rods that i have heard give out between 250HP and 300HP but there are some aftermarket rods made by eagle that can withstand 600HP
01-02-2007, 11:33 PM
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Well, the pistons are actually the weak part of the engine. The rods only get 10% of the stress put on from the pistons. The pistons are weak because they have VERY little space between the piston rings and the top of the piston, making them bad for FI. You can go much more then 250hp on the connecting rods, its the pistons that are going to get you. But if your going to get nitrous, then you may want some forged pistons and rods, then you can throw a 100 shot on it if you wanted to.
Nitrous is kinda like a really hot, skanky chick. They are really hot to look at, but you never really wanna hit it.
Nitrous is kinda like a really hot, skanky chick. They are really hot to look at, but you never really wanna hit it.
01-02-2007, 11:44 PM
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01-03-2007, 01:34 AM
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X2 When I drive my dads 2.2L Ion, I shift at 6. From 6 to 6500 rpm it seems to take FOREVER, the motors just screaming at you by then.
01-03-2007, 03:24 AM
#11
Well, the pistons are actually the weak part of the engine. The rods only get 10% of the stress put on from the pistons. The pistons are weak because they have VERY little space between the piston rings and the top of the piston, making them bad for FI. You can go much more then 250hp on the connecting rods, its the pistons that are going to get you. But if your going to get nitrous, then you may want some forged pistons and rods, then you can throw a 100 shot on it if you wanted to.
Nitrous is kinda like a really hot, skanky chick. They are really hot to look at, but you never really wanna hit it.
Nitrous is kinda like a really hot, skanky chick. They are really hot to look at, but you never really wanna hit it.
01-07-2007, 09:27 PM
#15
I'm old school
To answer your question, the stock engine can safely spin at a bit over 7000 RPM. The limiting factors become the Balance shafts and the valve springs. With neutral shafts and better springs, you get up over 8000 RPM. The engine has been built in race applications to 10,000 RPM.
However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.
However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.
01-07-2007, 09:31 PM
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To answer your question, the stock engine can safely spin at a bit over 7000 RPM. The limiting factors become the Balance shafts and the valve springs. With neutral shafts and better springs, you get up over 8000 RPM. The engine has been built in race applications to 10,000 RPM.
However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.
However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.
01-08-2007, 02:31 AM
#17
gotta reember...Power=torque*RPM/5252
To answer your question, the stock engine can safely spin at a bit over 7000 RPM. The limiting factors become the Balance shafts and the valve springs. With neutral shafts and better springs, you get up over 8000 RPM. The engine has been built in race applications to 10,000 RPM.
However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.
However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.
it would still be beneficial with new cams is what im sayin
01-08-2007, 11:13 AM
#18
I'm old school
Looks like HunterKiller above got it. I never said anything about how to shift. I was saying that torque is what accelerates the car. So since higher RPM will make more horsepower but not more torque, there isn't too much point in raising the stock RPM since you can achieve best acceleration within the RPM band already available.
But talking about shifting, you would want to shift at a point that drops the RPM to just above the torque peak to keep the engine at max available torque through the gears. I think some Porsches actually have the torque band marked on their tachs.
Well sure, with a cam change you could move the torque band. But now you are getting into some serious stuff. I don't know of any aftermarket cams that are geared toward high revving power. I'm not sure of what the GMPP racing cam set is designed to do. You would need probably need a custom grind.
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